Research And Application Of Air Supply Opening Models In CFD Simulation

When we use CFD technology in numerical simulation of indoor air flow, the conditions of air supply diffusers have a great influence on the indoor air flow, The air jet of air supply diffusers and the indoor air mixed in the air conditioning room to achieve the purpose of the air conditioning and ventilation, therefore, as the main source power of indoor air flow, air jet have decisive impact on indoor air distribution. In order to reflect the details of the air supply diffusers, in CFD numerical simulation, the grids of air supply diffusers must be meshed to millimeter level, and also when we simulate the in indoor air flow, in order to reflect the great vortex flow of indoor turbulence, the effects of the area are calculated to meter level. In this case, all the things above lead to huge numbers of grid nodes calculation, not only to the performance requirements of computer are very high, but also need to spend a lot of time and effort. Therefore, no matter to improve the calculation accuracy and computing speed, the model of diffusers description method the model research, all have very important significance.This paper firstly has a more detailed analysis and evaluation on the existing diffuser model, the author sums up their advantages and disvantages. Basing on that, we put forward a reasonable and effective multi-defined outlet model. Secondly, this paper presents the common types of outlet model, such as shutter tuyere, air diffusers, also give the flow of multiple tap definition draught model jet yuan value reference number N. Then based on multi-defined outlet model of the shutter draught and the flow of the air diffusers isothermal in air supply free jet and indoor air flow example was verified. The simulation results have a good agreement on the experimental data, it is shown that multi-defined outlet model have a good application in common air conditioning and ventilation engineering.The work of this paper provide guidance and reference for the special issues of indoor air flow numerical simulation,which to get more faster and more accurate description method on the air supply modle.